Radio Communication

1. A method of communication over a cellular telecommunications network using an electronic device, wherein the method comprises: communicating a session control signal from the electronic device to a session control module, located within the cellular telecommunications network, on a first non-IP radio channel provided by the cellular telecommunications network, the session control signal comprising identification data identifying a remote party, communicatively coupled to the cellular telecommunications network by the Internet, for an IP-based communication session with the remote party over the cellular telecommunications network and the Internet; the session control module within the cellular telecommunications network using the identification data to cause a Session Initiation Protocol (SIP) stack within the cellular telecommunications network to establish an IP-based communication session with the remote party through a gateway between the cellular telecommunications network and the Internet; and communicating content data for the IP-based communication session, sent by the remote party to the electronic device or sent by the electronic device to the remote party, between the electronic device and the cellular telecommunications network on a second radio channel provided by the cellular telecommunications network.

2. The method of claim 1 , wherein the cellular telecommunications network comprises a Long-Term Evolution (LTE) telecommunications network.

3. The method of claim 1 , comprising: communicating respective session control signals from each of a plurality of electronic devices to the cellular telecommunications network on a first set of respective non-IP radio channels provided by the cellular telecommunications network, each session control signal comprising identification data identifying a respective remote party, communicatively coupled to the cellular telecommunications network by the Internet, for a respective IP-based communication session with the remote party over the cellular telecommunications network and the Internet; the session control module within the cellular telecommunications network using the identification data to cause the SIP stack within the cellular telecommunications network to establish a respective IP-based communication session with each remote party; and communicating content data, for each IP-based communication session, sent by the remote party to the electronic device or sent by the electronic device to the remote party, between each electronic device and the cellular telecommunications network on a second set of respective radio channels provided by the cellular telecommunications network.

4. The method of claim 1 , comprising the cellular telecommunications network receiving the session control signal from the electronic device and, in response, sending an IP-based session control signal out of the cellular telecommunications network through the gateway to the Internet.

5. The method of claim 1 , wherein the second radio channel is a non-IP radio channel, the method comprising the cellular telecommunications network converting the content data between a non-IP format for the non-IP radio channel and an IP-based format for sending or receiving over the Internet.

6. The method of claim 1 , wherein the first radio channel and second radio channel are different radio channels.

7. The method of claim 1 , comprising the cellular telecommunications network converting the content data between a first encoding, used when the content data is communicated over the second radio channel, and a second encoding, different from the first encoding, with which the content data is encoded when the content data is received by the cellular telecommunications network from the remote party, or when it is sent by the cellular telecommunications network towards the remote party.

8. The method of claim 1 , comprising communicating one or more further session control commands or session status messages, over the first radio channel, between the electronic device and the cellular telecommunications network.

9. The method of claim 1 , comprising: communicating a message signal between the electronic device and the cellular telecommunications network on the first radio channel, the message signal encoding message data; and the cellular telecommunications network sending the message data to the remote party within the IP-based communication session, or receiving the message data from the remote party within the IP-based communication session.

10. A radio communication system comprising an electronic device configured for communication over a cellular telecommunications network, wherein: the electronic device is configured to send a session control signal to a session control module, located within to the cellular telecommunications network, on a first non-IP radio channel provided by the cellular telecommunications network, the session control signal comprising identification data identifying a remote party, communicatively coupled to the cellular telecommunications network by the Internet, for an IP-based communication session with the remote party over the cellular telecommunications network and the Internet; and the electronic device is configured to send content data for the IP-based communication session established with the remote party by the cellular telecommunications network, to the cellular telecommunications network, or is configured to receive content data for the IP-based communication session established with the remote party by the cellular telecommunications network, from the cellular telecommunications network, on a second radio channel provided by the cellular telecommunications network.

11. A method of communicating message data over a cellular telecommunications network using an electronic device, wherein the method comprises: communicating a message signal between the electronic device and the cellular telecommunications network on a non-IP radio channel provided by the cellular telecommunications network, the message signal encoding message data; and the cellular telecommunications network sending the message data to a remote party over an IP-based communication channel, or receiving the message data from a remote party over an IP-based communication channel.

12. The radio communication system of claim 10 , further comprising the cellular telecommunications network, wherein the cellular telecommunications network comprises the session control module, and wherein the session control module is configured to use the identification data to cause a Session Initiation Protocol (SIP) stack within the cellular telecommunications network to establish the IP-based communication session with the remote party through a gateway between the cellular telecommunications network and the Internet.

13. The radio communication system of claim 12 , wherein the session control module is configured to receive the session control signal from the electronic device.

14. The radio communication system of claim 12 , wherein the cellular telecommunications network is configured to be able to provide one or more IP radio channels to the electronic device and to provide one or more non-IP radio channels to the electronic device.